Unfortunately, creditors are not required to report to any credit reporting agency. It would be worth a try, though, to call each of your creditors and request that they report to both TransUnion and Equifax.

Creditors may have different relationships with each bureau. My guess is that the creditors in question use Experian for pulling reports, and are thus generally closer to them. There may be some contractual obligation to report the accounts, including positive info. Those creditors may have arraingements to only report to the other two bureaus if something negative happens, like late payments or total default.

Some creditors have the idea that they don't want to report too much positive info, since it will show their competitors who the good customers are.

I suggest writing (*not* calling) customer service at the creditors, and requesting that they submit the account info to Equifax and T-U.